HTML5 postMessage

在HTML5中新增了postMessage方法，postMessage可以实现跨文档消息传输（Cross Document Messaging），Internet Explorer 8, Firefox 3, Opera 9, Chrome 3和 Safari 4都支持postMessage。

　　可以通过绑定window的message事件来监听发送跨文档消息传输内容。示例代码如下：

eg.) parent page

Html代码

<span style="font-size: small;"><!DOCTYPE HTML>
<html>
<head>
<title>Communication</title>
<script>
var messageChange = function(e) {
var data = e.data;
var origin = e.origin;
if (origin !== "http://www.example.org") return;
document.getElementById('display').innerHTML = data;
};
if (typeof window.addEventListener != 'undefined') {
window.addEventListener('message', messageChange, false);
} else if (typeof window.attachEvent != 'undefined') {
window.attachEvent('onmessage', messageChange);
}
</script>
</head>
<body>
<div id="display">Say something!</div>
<iframe scrolling="no" frameborder="0" width="0" height="0" src="http://www.example.org/html5/postMessage/sub.html"></iframe>
</body>
</html>
</span>
<span style="font-size: small;">
</span>

<!DOCTYPE HTML><html><head><title>Communication</title><script>var messageChange = function(e) {var data = e.data;var origin = e.origin;if (origin !== "http://www.example.org") return;document.getElementById('display').innerHTML = data;};if (typeof window.addEventListener != 'undefined') {window.addEventListener('message', messageChange, false);} else if (typeof window.attachEvent != 'undefined') {window.attachEvent('onmessage', messageChange);}</script></head><body><div id="display">Say something!</div><iframe scrolling="no" frameborder="0" width="0" height="0" src="//www.example.org/html5/postMessage/sub.html"></iframe></body></html>

eg.) sob page

Html代码

<span style="font-size: small;"><!DOCTYPE HTML>
<html>
<head>
<title>Communication</title>
<script>
setInterval(function(){
window.parent.postMessage("hello world!", "http://www.example.org");
},1000);
</script>
</head>
<body></body>
</html></span>
<span style="font-size: small;">
</span>

<!DOCTYPE HTML><html><head><title>Communication</title><script>setInterval(function(){window.parent.postMessage("hello world!", "http://www.example.org");},1000);</script></head><body></body></html>

DEMO见附件，更多HTML5相关demo地址：http://html5demos.com/

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